Mechanical movement



(No Model.) 2 Sheets-Sheet 1.

D. B. HARTLEY.

MECHANICAL MOVEMENT.

No. 278,011. h Patented May 22,1883.

No Model.) 1 2 Sheets-Sheet 2. D. B. HARTLEY.

MEGHANIGAL MOVEMEN No. 278,011. Patented May Z2, 1883.

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UNITED STATES PATENT OFFICE.

D. BERT HARTLEY, OF CHICAGO, ILLINOIS.

MECHANICAL MOVEMENT.

SPECIFICATION forming` part of Letters Patent No. 278,011, dated May 2.2, 1883.

Application tiled November 24, 1882. (No model.)

To all whom it may concern:

Be it known that I, D. BERT HARTLEY, of Chicago, county of Cook, and State of Illinios, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a full, clear, and exact description, that will enable others to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, forming a part of this specification.

The object of this improvement is to provide a substitute for the ordinary crank in converting a rotary into a reciprocating motion, as will be hereinafter more fully set forth.

Figure 1 is a side elevation embodying my improvement; Fig. 2, alongitudina-l sectional view in the plane 3 3, Fig. 3, looking outward; and Fig. 3,a vertical transverse section in the plane 2 2, Fig. 2. p

' Referring to the drawings, A represents the fly-wheel, A the main shaft, and A2 the connecting-rod, ofa steam-engine. The continuous or endless rack B is attached to the outer end of the connecting-rod A2. This rack is of an oval elongated form, and is provided with a continuous row of gear-teeth on the inner circumferential surface, as. shown in Fig. 2 of the drawings. This rack is provided with the central hub,C, which is of a form corresponding to that o f the rack,and is secured in relation thereto by thestrengthening-ribs a. These radiating ribs project outward a little, as shown in Fig. 3 of the drawings. The hub C is provided with theinner projecting elongated bearing, a', which has a continuous reciprocating bearing on the outer'end of the main shaft projecting alittle beyond theplane of the pinionD,placed upon androtating with the main shaft. The pinion D engages with and rolls around on the inside of the rack B, these parts having acontinuous engagement with relation to each other. The elongated bearin g a serves as a guide in retaining the pinion and rack in proper relationto each other, particularly when the under side of the bearing a is in contact with the end of the main shaft, as at this-time The rack, ofcourse, will be of the same length vas that ofthe stroke ofthe piston; but by varying the length of the stroke the main driving shaft of 'the engine, or other body to which the device is attached, may make one or more revolutions while the reciprocating body is making a single stroke.

l am aware that mechanical movements have been made with a pinion with fixed bearings and for its shaft moving upon an oval rack that alternately rises and falls to meet the pi nion, which is supported by pivoted rods to accomplish this movement. My device diiers from that form, in that I dispense with the pivoted bars, Which are liable to become Worn or useless. Furthermore, such a movement is not adapted to be used on a steam-engine. Therefore What I claim is- 1. In a mechanical movement, the combination, with a hub, C, having elongated bearing a', radial ribs a, and an elongated rack, of a pinion having its cogs in contact with the shaft and the end of its shaft in contact with the elongated bearing, substantially as described.

2. In a mechanical movement, the combinavtion of a connecting-rod or other immediate connection between a rotary and reciprocating 'body having an elongated rack at one end,

provided with arms attached to an elongated hub, and a pinion which meshes with said rack vthe pinion .and rack would be more liable to become disengaged than at any other point and has a bearing on said hub, substantially 8o as described.

D. BERT HARTLEY.

. Witnesses: L. M. FREEMAN, L. B. GOUPLAND. 

